//
// Created by MightyPork on 2023/04/09.
//

#include <stdbool.h>
#include "screen_menu.h"
#include "app_gui.h"
#include "FreeRTOS.h"
#include "task.h"
#include "ufb/utf8.h"
#include "ufb/framebuffer_config.h"
#include "ufb/framebuffer.h"
#include "ufb/fb_text.h"


void screen_menu(GuiEvent event, const char **options, menu_callback_t cb) {
    bool menu_changed = false;
    const uint32_t tickNow = xTaskGetTickCount();

    struct menu_state *menu = &s_app.menu;

    switch (event) {
        case GUI_EVENT_SCREEN_INIT:
            menu->pos = 0;
            menu->len = 0;
            menu->change_time = tickNow;
            menu->text_slide = 0;
            const char **opt = options;
            while (*opt) {
                menu->len++;
                opt++;
            }
            break;

        case GUI_EVENT_SCREEN_TICK:
            // long text sliding animation
            if (tickNow - menu->change_time >= pdMS_TO_TICKS(500)) {
                const uint32_t textlen = utf8_strlen(options[menu->pos]) * 6;
                if (textlen >= FBW - 2) {
                    if (textlen - menu->text_slide > FBW - 1) {
                        menu->text_slide += 1;
                        if (textlen - menu->text_slide >= FBW - 1) {
                            menu->slide_end_time = tickNow;
                        }
                    } else if (tickNow - menu->slide_end_time >= pdMS_TO_TICKS(500)) {
                        menu->change_time = tickNow;
                        menu->slide_end_time = 0;
                        menu->text_slide = 0;
                    }
                    request_paint();
                }
            }
            break;

        case GUI_EVENT_PAINT:
            for (int i = 0; i < menu->len; i++) {
                // is the row currently rendered the selected row?
                const bool is_selected = menu->pos == i;
                const fbcolor_t color = !is_selected; // text color - black if selected, because it's inverted
                const fbpos_t y = 27 + i * 10;
                fb_rect(0, y, FBW, 10, !color);
                fb_text(1 - (is_selected ? menu->text_slide : 0), y + 1, options[i], FONT_5X7, color);
                // ensure the text doesn't touch the edge (looks ugly)
                fb_vline(FBW - 1, y, 10, !color);
                fb_vline(0, y, 10, !color);
            }
            break;

            // the button is held! release is what activates the button
        case GUI_EVENT_KNOB_RELEASE:
            input_sound_effect();
            cb(menu->pos);
            break;

        case GUI_EVENT_KNOB_PLUS:
            if (menu->pos < menu->len - 1) {
                menu->pos++;
                menu_changed = true;
            }
            break;

        case GUI_EVENT_KNOB_MINUS:
            if (menu->pos > 0) {
                menu->pos--;
                menu_changed = true;
            }
            break;
    }

    if (menu_changed) {
        menu->change_time = tickNow;
        menu->text_slide = 0;
        menu->slide_end_time = 0;
        input_sound_effect();
        request_paint();
    }
}